Happy new year tsikoteers!

I have a problem with the level of my clutch fluid which keeps on decreasing for months already since August pa ata last year. Haven't brought it to a workshop since topping it off with additional fluid every 3 days or once week worked for a while at medyo abala pa sa expenses last year especially during December. This week napansin ko na mabilis bumaba and level the fluid and I have to refill the fluid container almost full everyday. I don't know much about clutches and it seems it needs to be urgently fixed. I need your help guys kahit na inputs lang on:

1.) what specific parts need to be replaced and the scope of work needed. Estimated cost? Should I go for repair kits if there's any? Orig or replacement?

2.) any other additional worn out parts to look out for replacement when the mechanic is at it para makapagtipid na rin sa labor?

3.) Even on a full clutch fluid reservoir, napansin ko na dapat babaan talaga and pag apak sa clutch para makapagreverse ang pickup... reverse gear would almost always make disturbing grinding sound when engaging even with a heavy foot on the clutch already. Would this be another clutch problem?

4.) Read somewhere here na dapat daw ibaba yung transmission for a clutch fix? Isolated case ba yung repair sa leaks?

BTW, ride is a 1997 Isuzu Fuego 4x2.

Thanks in advance!