How to fight against someone very agressive

I've don muay thai for less than a year and have 4 years of boxing backround, and i'd say my technique is ok and i have some power behind my strikes.

There are a few people in my gym who are really agressive in sparring, they go too hard for technical sparring, but the biggest problem for me is that they really don't give you any space to learn anything or even think. Especially as a somewhat beginner it's annoying asf not being able to try any combos i've learned etc.

How do i deal with someone who constantly is coming after you and hits you with 90 - strike combos. Now pretty much all i can do is keep my full guard up all the time and throw jabs, leg kicks and teeps.

Also one of these guys is trying to catch every single one of my kicks and sweeps me everytime he gets the chance, in technical sparring.

Thank you!