how can i increase my mmr after these......?

As would I, but sadly, balancing such a system would be a nightmare, and if it isn't balanced properly, it will end up being exploited. Until someone has a stroke of genius and comes up with a decent MMR system, Solo Ranked just isn't worth it.

Solo MMR is worthless, on the brightside Normal Matches are getting better since most ppl migrated to ranked lol.

First match... you have anti-mage and medusa against a mid-game lineup. You were destined to lose this one. Whoever was captain was a ****** and all the players that agreed with him. Also critstick and deso on invoker? Dude you're a joke...
Second match. Hmmm... lets see... The dazzle did "mental" supporting as it seems giving his 3 kills and 13 deaths and the items he have for such a score. Nice line-up but 11 deaths with weaver means you fed early in the game... and don't tell me that weaver is hard to play offlane even if they have sentry wards. (if you even played here on an offlane)
Third match... you got outdrafted... again lol. I also don't get whats your problem with getting escape and defensive items on Invoker. Like BKB, force and the such.
I really didn't want to sound like a **** and just flame you but before you complain about MMR matchmaking and etc step up your own game because you're not even half as good as you think you are.

SeekHeart puts it perfectly. I am back to playing pubs for now. When DotA was 'calibrating' my MMR I won most of my matches, but since I received my MMR I have not won a single Solo Ranked match ~~~~ When I lost, I did notice that I went down -25 points but once I went down -24 points. I didn't know why so thanks for some of the explanations offered behind why this might have occurred. GLHF. Lates.

Same, although I only ever play in stacks these days. Mind you, when I'm in a 4-stack, more often than not, the random 5th is actually fun to play with. Sometimes, they're actually good players! 8{D

I feel like the better mid player you are, the better solo MMR rank you'll have. If I play supports I lose in solo, carry I'm 50/50, pick Nevermore or Voker, I win more than I lose. Recently I've been just picking Ember Spirit..It works but I'm in 3k purgatory (decent game knowledge, lack of skill to apply it). Team MMR has fluctuated from 3800's - 3065 ...so yes, playing with friends that are worse than you is bad sometimes, but on both accounts, I'd like to play devils advocate: I take it hard on myself when I lose, I love this game, I want to improve..so yes bad teammates happen, but not every damn game, so it's a mix of things, hero choices, item choices, positioning, map awareness, individual skill. Just play, avoid solo simply because playing this game and enjoying it with friends or laughing at the bad games is just more fun.

Well i went ember spirit for the past 15 games and only lost 1. MMR went from 2500 to 3000.
Untill the game just now when the noobest LS in history fed the weaver to victory.

This is not something that can be 'fixed'. People keep complaining about how they can't raise in MMR etc. But the fact is that this is a team game, where you are randomly assigned team mates and hope to win. Technically the only real way to have major control is to play a hero role that has the most control in winning, mostly snowballers in mid. Otherwise there's nothing that can change it.
Individual skill is hard to gauge, and easy to exploit.

Its an eternal fight of players vs players that will be hard to fix because of the team-aspect of Dota.