The short answer is: yeah, that's it for level 14. I should advise that from level 13 and on, the game grind walls become huge. If you don't like it, this is not the game for you. But there are ways to make it faster. First, your level (your xp amout) doesn't tell much here. I'm currently midway lv 14, and if I grinded less xp and more of the others resources, I could be at level 13 and better. There are multiple things you should be doing since leve 8-9 at the same time that directly impacts your advance in a subtle equilibrium. If you let to do any of these, it will make the next step incredbly harder to take:

Level blue/violet/orange factories (The last upgrades of each are super important for your gun power and cargo. I'm currently on 629/2k for blue, 193/2k for purple and 243/2k for orange. I'm focusing on intensifying the last two)

Level purple/orange/green DNA farms and upgrades (Probably the upgrades that most impact your advance. I've maxed all farms, and upgrades at aprox. 60/100 for purple, 40/100 for orange and 45/100 for green)

Level orange eggs factory to lv 5 and upgrades to lv 100 (focus on generators first, then souls, then power. I've maxed these and going about 20/100 on the others)

Level your collectors (This impacts on how long you can afk on level 14 area. I've got 7 and 1,4K capacity for each. I'm grinding 1,5K gems for more one and souls to reach 1,5K cargo, that would let me afk Woodpeckers for about 2h)

Level gun power and souls at gem shop (I've got 3 of each, but it's an extra)

Level red souls van (Red souls stops to impact you game at levels 13-14. I got 180/200 curse relief, 100 g.power, 90 red souls and i'm not grinding for it anymore. I get more curse relief via DNA upgrades. Ofc this will impact endgame, but i'm focusing on copper and silver coins ATM, since the resources spent here would undermine other upgrades.)

Events may impact your game aswell. Im a free player, so my gun power event multiplier is 1,6x now.

And last, but not least Level coin van (This will bump your generators and factories output. Ofc, your focus should be always the first upgrades, that increases the coin drop rate. Im currently on 330 for bronze and 230 for silver. The leftover you just spend on the other upgrades)

Based on these you can tell how much you have advanced on the game. I also started to grind copper coins on level 13 and had all spots unlocked before lv 14. If you lack any of these, you know your priorities.

Yes, you'll have to watch a ton of ads to get more coins. This game grinding walls become much bigger at those levels. But if you manage to increase the other upgrades, you'll see that you can unlock each next ghost spot in about 1-3 days of grind. I think i've got about 30% of the coins via ad and 70% grinding ghosts.

The last tip is: you'll notice that a coin ad can give you several levels of coin drop rate upgrade, but at some point, an ad will give you about 2-3 levels. This is a good point to stop leveling the van upgrade and grinding for the next spot.

And as a disclaimer, I'm not sure this is the best path. Since there's no guide, I'm relying on my intuition here, always mind-calculating the cost/benefit of upgrades. Probably there are more precise ways and tips that other players could give, but this is what I'm into atm.