any tips on how to multitable better are appreciated

I am currently pretty much lost with more than 4.

then you probably arent ready for more tables and could easily turn a winning player to a losing one.

No need to be some kind of multitabling ninja. It's about winrate.

Play as many tables as you feel comfortable at, and then when you're happy with that amount, add another one, and so on, and so on....

When you're learning, it's much better to play less tables and think about what your doing and make good decisions, than play like a robot and make bad decisions.

Setting up hot keys or using tools like tableninja can help, understanding HUD stats well, but as mentioned earlier if you are relatively new it's best to concentrate on learning.
Don't forget if you play 2 tables at 1/2 and get good enough to move up to 2 tables at 2/4 you can earn as much as learning how to m-t enough at 1/2 to get the same.
How many tables is always a personal decision but too many people think the answer to profit is in massive multi-tabling.
You can support more tables on different types of game, it is easier with tournies/SnGs than cash.
Also if you can earn the same amount per hour 2 tabling 2/4 as 4 tabling 1/2 you actually get a narrower Normal 'bell curve' for the time you play so your results are more consistant, with smaller downswings (or upswings) this helps some people. In the long run it doesn't matter but you also probably learn easier.

Play what you're comfortable playing. If you start to feel overwhelmed by decision points, its probably time to lose a table.

Personally, even though I can multitable 6-8 tables, I don't find it fun and usually stick with 2-4. But that's a function of my poker goals.

tx it helps. I am just trying to do 10 k hands starting from lowest up to where I am actually playing. It is not for money but just for a project. So I am trying to do it fast

I'm a quality over quantity kind of guy. I cant intelligently play any more than 4 tables and I'm fine with that. I'd probably sacrifice a portion of my bottom line if it meant playing less tables just to stay happy in the game, since I wouldnt want my life to become a huge painful grind just by mass-tabling.