New gTLDs are a risky investment as there is no general value, this is reflected from their being very few sales, and new TLD in general not selling much. However, some gTLDs are selling, and the risk can be lowered a fair bit by using a more known gTLD and/or good keyword which fits the TLD. ie "night.vision" (sorry, but it's a good example..) or "Green.world" which sold for $8.5K recently. The keyword and TLD go perfectly together.
The problem comes when people think any keyword is valuable because it would be valuable in com or even net. It's just not the same, at all. "wine.club" sold for 6 figures, but that does not mean even decent club domains are all suddenly worth 3 and figures and up. There are always exceptions to the rule, even in com where some names sell for ridiculous amounts.
The key is be sensible, wise, and expect to potentially hold the name for years for a decent offer, or possibly just never sell at all as you are waiting on very few end users.
The future is unclear, and only takes a large swarm of large sites using new gTLDs etc and it could kick off (and com would not be left behind, it would just become even more valuable). Or it might just be as it is, steady away with some sites using new TLDs, and those with decent budgets use coms etc.
We cannot really value these names with any degree of accuracy as it is only what someone is willing to pay, not a general market value based on previous sales like we find in most com names. For royal.estate, you might simply never sell it, or someone might happen across it who has a perfect project, and budget.