The only cure is to find a greater purpose than material things. I know what u mean man, hit a similar milestone myself.
Im finding it helps to acquire new skills in the time I seek the true purpose, or it finds me. Like finding a language u like and dedicating an hour per day to it. It can open new experiences that money cant buy. Money cant buy you relating to ppl in native tongue or skills in something worth pursuing for you.
Also, a purposeful day adds up to a purposeful life. I endeavour to fill each day with some purpose because days add up and u can become really good in something u been putting off, like some instrument or smth, if u put an hour per day in it.
Its a mindset change its not easy but there is no other way. If u scared of the big unknown of the future, split it up into 24 and tackle those as best u can.