I think many people find they'll have phases in their lives when music gets shoved aside by the rest of life - for me that came when I was a student the first time, and had to stop playing my oboe because I couldn't get a practice room often enough and had had to make a decision to play piano or oboe - there just wasn't the chance to do both. The second time was when I started on my 84-hour working week - that was an average, and in practice meant 120 hours one week, fewer in the next two, but being boss-eyed with tiredness all the time and barely able to function, all in a context of no access to a piano at all, as well. The third time was when looking after small sprogs whilst still doing a ridiculous working week.
You've got grade 8, so have made significant progress over the years, and should have interesting repertoire within your reach. I now buy collections of music rather than single pieces, so that if one piece catches my interest, I can try others in a similar genre/by the same composer. A starting point might be one of the pieces you'd done for grade 8 - was there one you particularly liked, and do you want to explore more in a similar vein? I'm lucky in that there are other musicians with whom I can play, too - that gives me focus and goals to work towards. I also did further exams after grade 8 - for me there were few opportunities to make music with others at that time, and I'd demonstrated that I was still capable of learning, so I used them to keep me moving forwards, until I started slowly finding other musicians (or they found me!). I also listen a lot to music which is relevant to the exam I'm doing during the preparation stages - then afterwards I find I want to branch out and listen more to other repertoire.
So, my tips would be - find music you liked when you were working for exams, and see if there's anything else along those lines which might appeal, listen to a broader range and check out anything which catches your attention: and look at exam lists above and below your level to see what else is out there, if necessary from more than one exam board. They're limited but give an idea of level, and can be a springboard to more. I'd also give fine polishing a bit of a break for a while, and try playing some less challenging pieces for fun. Some will have something hard on the go, another easier piece or two, and a stack of stuff for busking through for some relaxation

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