To break the 2000 boundary shouldnt be too ambitious.
Suggestion 1. Check if you have a reasonable grasp of practical endgame play.
(especially rook-endgames (basisc technique, 3 against 2 pawns, 4 against 3 pawns).
Suggestion 2. Your tactical ability has to be maintained. (work through van Wijgerden step 3 thru 5 again! and again, or find some other nice puzzle book). The important thing is that you train
regularly, so that you are able to recognize more tactical patterns.
This shouldnt be too time consuming, you can just solve from the diagrams half an hour or so, two times a week.
Suggestion 3 Review your opening repertoire. Are you comfortable with the positions you get?
(example: Are you often outplayed in closed positions, then alter your opening repertoire to avoid these...)
Look back at your own games. In which variations do you score badly? Study what went wrong, and look up how you should have played after the game.
Suggestion 4 Ask advice about mistakes and chances you missed, from stronger players on your club.
They probably will part with invaluable advice for a free beer.
And try to remember what they said (sometimes difficult after a few beers
)
Breaking the 2200-2300 boundary is much more difficult (you'll meet a lot of walking, talking databases!) But if elo- and title inflation maintain their present pace, even that may be attainable in another decade.