The best replacement for ojala is ojala que.

The best alternatives to ojala are rated as following:
★★★★★  ojala que
★★★★★  espero

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Speaking about ojala, one probably shouldn't forget about subjunctive.

Other search terms related to ojala and their ratings are:
★★★★★ subjunctive
★ imperfect subjunctive
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ojala
ojala que
espero