Because your coins is bullshit too,that is why there are no improvements,HOLDING good altcoins and tokens will give you a lot of profits but holding these shitcoins which doesnt have good working product/services wont give you anything even you waited hundreds of years.Do a lot of research find new potential coins or projects only invest to good projects,read whitepaper check the team,the current developments and im sure your holdings will give you much better outcome.
Exactly what I think! and I can't say better than this, the coins you hold also becoming an important factor to decide whether you will get or at least making a profit out of holding all these things or not. For example, you can try to hold joke coin with barely any volume for 100 years. it will become like that or near to dust because it will simply delisted from all exchange.
So, better to analyse first about your portfolio before holding and that's the most important thing, don't ever waste time on such stupid coins again.