Wages - as you put it in the first post, are only a small part, there is the work-life balance to consider too - an hour of free time to spend with the family is easily worth an hour on the pay check once all the bills are paid. We could all chase the ££, weekly commutes to job sites miles away - but that comes at a cost when you have family to consider. I've always reckoned that you can earn big ££ and have no life of your own, or earn nothing and have 24 hours a day to fill... and somewhere in the middle is where you want to be.
Might be you are happy spending all day with a chainsaw and taking a wage home at the end of the day, no pressure to run a business, no pressure to earn bigger money. Might be that you are happy to earn similar sitting at a till in Tesco (other supermarkets are available) (that would drive me mad).
At 33 you are not past it - working the last 10 years on a farm probably hasn't given you a beer gut and a sit on your backside attitude - plenty of life left and an attitude to graft if needed? Do you have (mentally at least) the time to work at getting tickets / other qualifications / build a second career alongside the farm work? (or do you need to get out now for your sanity?).
Looking at what you say, degree, worked in farming, a love for the land? then environmental stuff might be the thing, maybe not mega ££ but if it pays enough the mental side will more than make up for the rest.
Rather than asking for what tickets you need just now, maybe there are some guys down your way you could have a face to face chat with (like in real life, IRL!), maybe shout them a coffee - no strings attached - who know the local market, big firms and small outfits operating your way who might get you a start - and they can tell you what tickets they would be willing to fund and what they'd like to see (different areas, different employment pressures, firms are more or less likely to train up depends how many people are looking for work locally)