In the last one year we see transaction fees is going down due to following reasons;
fees weren't high all year last year to come down now. they were high for a couple of months and came down as soon as spam stopped.
1. Users are making fewer transactions. Transactions nearly half at 200000 presently from 400000 perday in December.
Due to this lower transaction demand charges came down. Transactions perhaps gone down due to higher charges.
your numbers here don't make sense. first of all number of transactions per day is nearly a fixed number because blocks have been full for about 2 years now and being full means bitcoin is used to its max capacity.
the numbers you posted at first (200k-400k) are number of unconfirmed transactions and it didn't half, it disappeared. from 200,000 down to 2,000 is not half.
2. Usage of SegWit (segregated witness) process under which signatures are removed from transaction thereby availability of space increases so with this free space more transactions can be added to that and so many transactions are done in single go; so the charges are distributed and so these are lower than previously charged. By the usage of segwit number of transactions remains the same but space consumed by them is lesser so it is cheaper.
since usage of SegWit is not yet that big (around 10% still) I'd say it wasn't the reason.
also what does it have to do with your title and holders?!!!
3. Migration to other alternative currency is also one of the reasons for falling charges. Many users are shifting towards other alt coins so the pressure (demand) in bitcoin ultimately decreasing and so charges going down.
why would anyone migrate to an altcoin? lets say I want to pay for something online, and they barely accept bitcoin, what would me migrating to an altcoin solve for me?!!!