Maximus,
Air Taxi is not an hour building option, minimum requirements for single pilot ops under JAA/EASA ops was 700 total time, with at least 40 hours p1 multi, quite often 1000 hrs total with 200 multi is often asked for. Besides there are not many ait taxi companies left these days.
As for ferry flying again a lot of insurance companies will require more hours than a fresh qualifier will have.
Tug towing jobs and para dropping jobs are quite rare, plus these days there isn't an abundance of FI positions. However the tail wheel time is useful, with a few hundred hours tail wheel you may be able to get onto a para dropping job on a turbine tail dragger (PC6 Porter, Stork, or Beaver).
In turn single turbine experience could get you into a company like Zimex, or flying a PC12 or TBM 850 for a fractional ownership syndicate.
However you did say your interest was airline, these days if that is your interest you are better served finding a high paying non flying job to fund a type rating.