A short family round the world (RTW) trip can be funded on savings. This is how we got started and year 1 cost us $30,000 back in 2013. $ US and $Au were pretty much equivalent back then.
In 2019 I honestly don't think it would cost much more as prices seem to have dropped as travel slumps. Of course, if you're packing a deflated currency like the UK pound, it would be much harder for you now.
You need to cut all expenses back home, you can't continue to pay a mortgage or big bills while you're on the road full-time or permanently. We rented our house out, others sell if homeownership looks like too great a financial burden.
Full-time travel, for our family, was way cheaper than staying home, and way more fun.By David N Brace