That would be guess work. At best, you might get lucky and stumble over something better. I think, the chances for that are highly unlikely. You'd have much better results if you learn, by direct measurement, what each driver's actual acoustic performance is. Good speaker crossovers must be custom designed for the drivers and the cabinets. Generic information about crossovers, without any knowledge about the performance of your three drivers will not help.
The crossover parts in your photo appear to be decent quality. (The crossover design, however, may not be the best for those three drivers.) Do yourself a favor and ignore any advice about getting better sound quality by replacing capacitors or resistors with more costly parts. Those myths are hardly any different than those advocating the use of exotic speaker cables.
In short, before you can do anything useful with those speakers, you must be able to measure the performance of each individual driver without a crossover filter. As TLS Guy said, such a measuring rig will cost you about the same as you plan to spend for new speakers. In addition, you will have to spend substantial time learning how to use it before you get useful results.