Yes yes & yes. I was also a sucker for thriller and crime books (mostly Agatha Christie) and couldn't get into any other genre FOR YEARS.

I started reading some mainstream romance novels which usually lack depth in characters and story but are easy to go through and read fast. These kinds of books motivate me to read more in general because I can read them in one day and feel accomplished. But since they lack depth they motivate me to try other genres and mix it up.

As the comment above suggested, you could try reading other genre that have thriller-like elements in them since it is not hard to find. Personally I wanted to try dark academia so I started the book If We Were Villains because it's dark academia with mystery and murder (but also many other topics) and found the change enjoyable.

Another suggestion is to find maybe shorter books and short stories/collection of short stories from other genres just to get used to it and later see if it is something you want to explore more. For example I want to give Dostoyevski a try but the number of pages in his books do not appeal to me, so I bought a shorter book of his White Nights to explore his writing style and hopefully motivate myself to read the longer ones as well. Good luck!